javascript : 全选checkbox

<script type="text/javascript">
    function selectAll(tempControl)
    {
        var theBox=tempControl;
        xState=theBox.checked;
        elem=theBox.form.elements;
        for(i=0;i<elem.length;i++)
        {
            if(elem[i].type=="checkbox"&&elem[i].id!=theBox.id)
            {
                if(elem[i].checked!=xState)
                {
                elem[i].click();
                }
            } 
              
        }
      }
    </script>

 <asp:CheckBox ID="CheckAll" runat="server" onclick="javascript:SelectAll(this);"

 

如果在后台写代码的形式：

protected void CheckAll_CheckedChanged(object sender, EventArgs e)
    {
         int intCount = GridView1.Rows.Count; 
         CheckBox checkall = GridView1.HeaderRow.Cells[4].FindControl("checkAll") as CheckBox;
         for (int i = 0; i < intCount; i++)
         {
          CheckBox checkSinge = GridView1.Rows[i].Cells[4].FindControl("CheckSingle") as CheckBox;
          checkSinge.Checked = checkall.Checked;
         }
    }